Sectional block-type scarfing tip



June 9, 1953 H. G. HUGHEY 2,641,312

SECTIONAL BLOCK-TYPE SCARFING TIP File d Aug. 23, 1947 s Sheets-Sheet 1 INVENTOR HOWARD G. HUGHEY -BY 1 MB YMWAA WHIT $13M I I (D (O M 1 Y W A,

w 7 U a E g E a a g a ATTORNEYS June 9, 1953 H. e. HUGHEY 2,641,312

SECTIONAL BLOCK-TYPE SCARFING TIP Filed 'Aug. 25, 1947 3 Sheets-Sheet 2 HOWARD 5. HUGHEY I BY mizfowwdqllwmrammm ATTORNEYS June 9, 1953 H. HUGHEY SECTIONAL BLOCK-TYPEv SCARFING TI P Filed Aug. 25, 1947 3 Sheets-Sheet 5 FIG. 9

VENTOR HOWARD G. HUGHEY ATTORNEYS .mn 1 v. I //7 I Patented June 9, 1953 SECTIONALBL'OCK-TYPW SGAZRFINGE TIP Howard GaiH-ughey, Eanwo 1 ,.'r.-N. iJ.,-.xassignm' to Airlfieductionrfiompany, Incorporated, accorupfllationibf New. York (This invention relates :to improvements :i-n

torch tips, and. more :particularly :to improve:

ments intips'ior scarfingv torches @oftheakindnsed for thermoechemicallys.desurfacing ferrousnmetril b0ldies.-.suchzassbillets, bloomspslabs, :andthe like.

z'iihea invention providesa segmental scarfing tipxofz the:blocktypev-whichrmaybe given any .des'ired' width. by :assemblingithe requisiteznumber of individual smallerblockz'tips' orascarfi-ng; segments. Each: individual :scarfing :segmentihas its own separately:;controlledsupply ofrscarfin oxygen and preheating :ugases so that the effective widthrof vthe: complete. tipmay Joe varied to adapt itl'forzscarfingu-surfaces -of-diferent-.widths. The individual :scarfing ;.segments rare -:speci ally peonstructedf notionlymorfaci-litate. theiremanufacture and to facilitate their assembly into the-complete tip,..-but: also to make it possibleto position the jet passagesufor the scarfingroxygen :close enough together ;t o provide (a substantially continuous sheetelike stream of scarfingzzoxygen across any desired:- active width oft-he :compos-itetip. some of these features of :the: invention, rand others hereinafterdescribed, =aremsef-ul :in'torchrtips .intended forzother :uses than; scarfing.

The :principal .object 1 .of the invention, therefore;vlisr to provide a-block type-segmental {scar-ting tip iofsimproved construction. mother objectsc-of the, invention iarecto provide-an improved cooling system fora segmental blockitype torch tip; to provide awsegmental gtorch tip in which --s-hocks oceurring during. use :of the. tip have 4 no harmful efiieots on the tip segments; ,to provide a (block type tip segment .of improved construction which facilitates itsamanufacture. and .iacilitatesits-fiassemblyiwith-other; similar;rsegmentslintosaacomposite' block. type segmental tip rtQuequipascarfing tip' segmentssvhich have independent-distributing cham-b ers' 'for the 'scar' fing oxygen-with means whereby in the complete tip assembled from-the segments: the pressure of the I scar fing -oxygen 'in the tlistributing-ehamber of any segment of' the tip -may' be readily ascertained; and "to provide an improved type'of shoe means for atorch ti'p block either ofthe'single r segmental "type" block' typesegmental tip-embodying the invention is illustrated in the accompanyingdrawings, in' which "Figure 1 is *afrontelevation of the assembled torch 'tip;

T Fig. 2 'isa left-"side View or the torch tip shown in' Fig. -1;

*Figw is -21; verticaltransverse-section taken ap- -proximatelyon theline 4- 4 o'f Fig. F3;

v 13 .Cl'aims. (o1. 158-274) .illligrfiisramight sideriew; of: theitorchiimshewn infie- .'s1=ig.-161:is1a transverse:verticalseotion:takemape proximately 201]. rthev line 6-4 "of Big. 3:;

:Fig. 3 :is re :iriew :corresporiding to 5 Fig. -16 but showings-theparts inmnassembled' relation;

spondin cooling passage :,-sections tin aadi amt scarfingv segments.

:Referrinefirst tom 1765a r1; theriseemental temh tip in illustratedz-therein K OmDI SBSeaI assem ly ofrnineaimlivisinm se mentsorm b cks. 'alfltfi semenzblocksdes nated;I hare: searfineA-seeme s of identical "eonstnuction. :The endmlock a'lso vaazsca-rfing :seementnhut difiers slightl construetion :iremithe soarfin n e ment L es will hereinafter? appear. The zsegment 1:3 att -the .otheraend of the-s-assemblviconstitutes .-a.;r;nar-1iie1d blockrfiorrthe wwaterr-oeol ng systemrforrth scem: plete riprfih i tip. One: of -,the 1 individual ssearfing segments 11 is iniperspectivetin:Eig a. All .so'f sthe A5110 aseementsearevelamped together-air one-.ilni :bywbolts M (Fig. 1,)...

{Ihe 131p 4 segments are married .-by Fa support, designated .lim eneralzhy :the reference mumeral I15 lain =.'Figs. :24 einelusive, having two singularly disposed portions .|6 -,and ,JJ preferably:i i-gene piecemyhiehaextendt the entire width iojqthe whole assembledggrouwof :scarfingssegments. -Each ef thersearfingqseg-ments isssecured at: its reanedge face tolthe portion I- GQ .ofw. the 2- srllmfirt,x by. -means oft-a screw-t8 .itliligs. Grand-7') ns.'show.nin Eigi-QG the screws I8 pass loosely through.-.heles 439 in the portion aliiaef thesnpport and ianeut'hneaded into amenities tin zath -=sca fins segments. h holesale in the sunmrt re 1i fi y r -in iameter,-;.than;thegserewsm8:sorthat when thesbelts :Msareitightenedzthe scarfinefi'wseementsimav more sidevrise. .;-I-f zany-f; the: scarfingise ments pen ito beisundersize width thesscrewsithw'ill not '.-rpre vent :the :segmerrts from ebeing :ibmu ht firmlyttogether.

ifrhe'spontion :11 ot sthezzsupnort ist5 vconstiimtes axshoe portionithe'souter sidezaof'iwhichifttahe lower side as v-iewe'd in Figs. 6::and 7') issprovidedrmith worm-engaging 'shoes as ahereinafiter -describe'd. qlhel'inneraside 'ofithezshoetpontion 1 1 @ttheimpper side; as-wiewediiniifiigsi same-1r) foemssansobtnse the support and all of the scarfing segments are so shaped that the rear edge face of each of them makes a corresponding angle with its lower edge face (as viewed in Figs. 6-8) so that the support and the scarfing segments are complementary.

The construction of each of the scarfing segments H is best shown in Figs. 6 and 7. Each of them comprises a composite block made up of a main body portion 20 and a plate 2| which is interposed between the body portion 20 and the shoe portion I! of the support; The face of the body portion 20 which adjoins the plate 2| is provided with a recess 22 and the plate2| is provided with a complementary recess 23. The two recesses 22 and 23 in conjunction form an enclosed scarfing oxygen distributing chamber 24 which is located wholly within the segment so that each scarfing segment has its own independent dis-' tributing chamber.

Thebo'dyportion 20 isdrilled to providea pair of vertical passages 25 (Figs. 3 and 6) leading to thedistributing chamber 24 from a threaded recess 26 in the upper edge face of the body portion (Fig. '7). Scarfing oxygen is delivered to the passages 25 by a pipe 21 (Fig. 6) leading to an inlet" connection 28 screwed into the threaded recess 26. Thus, scarfing oxygen delivered by the pipe 21 passes directly to the scarfing oxygen distributing chamber 24 throughthe passages 25.

i As best shown in Fig. 8 the composite tip segment formed by the main body portion 20 and theplate 2|has a nose portion which is formed by the convergingfront edge face of the tip segment and the face which rests against the upper surface of the shoe portion ll of the support. This nose portion is truncated to form one face 29 which lies in one plane and another face 3|] which-lies in a plane having aless steep angle with the work surface. The jet passages for the preheating gases open through the face 30 as will hereinafter appear. The'face 29 has a recess 3|, preferably dovetail shape in cross-section, which extends transversely across the tip segment. The bottom 32 of thisrecess constitutes the discharge face for the scarfing oxygen'jets. As will be seen from Figs, 6 and '7 the dovetail recess 3| is formed partly in the main body portion 20 of the'composite tip segment and partly in the plate 2|- of the tip segment, one side of the recess being in the body'portion and the other side being in the plate. The two complementary portions of the dovetail recess can be conveniently formed in the parts before they'are assembled, whereas it'would. be difiicult to machine a recess of that cross-sectional shape in a single solid block.

Theplate 2| is drilled to provide a series of jet passages 33 (Figs. 6 and 7) which lead from the distributing chamber 24 to the bottom wall 32 of'the recess 3|. Just forward of the scarfing oxygen distributing chamber 24 there is a distributing chamber for the gas mixture that feeds the preheating flames. This distributing chamber may compris'e' a cross bore 34 in the body portion'20, the opposite'ends' of which are closed by plates, one of which appears at 35 in Fig. 8. The abovementioned face 3|lat the nose of the tip segment is drilled to provide a row of jet passages 36 (Figs. '6 and '7) which communicate with the distributing chamber 34 and terminate in a row of discharge orifices 31 in the face (Fig. 8). A sec- .ond cross-bore 38 (Figs. 6 and 7) intersects the jet passages 36 and creates more equal distribu- ;tion'of*.the gas mixture to therow of jet pas- 4 sages and an even flame front when the mixture issues from the discharge orifices 31 and is ignited. The opposite ends of the cross-bore 38 are closed by two plates one of which appears at 39 in Fig. 8.

A gas mixture for the preheating flames is delivered to the distributing chamber 34 by a vertical passage 40 drilled into the lower face of the body portion 20 (Fig. 7) and having a lower portion 4| of relatively large diameter, an intermediate portion 42 of smaller diameter, and an end'of the passage 48 there is a threadedrecess' 50 into which is screwed an inlet connection 5|- (Fig. 6) associated with a preheating oxygen supply pipe 52. The preheating oxygen entering through the'passage 48 mixes with the fuel-gas in the passage 40 and the mixture'is delivered to the distributing chamber 34 from which it passes through the row of jet passages 36 to feed the row of preheating flames at the discharge orifices'3'l (Fig. 8). The portion 49 of the diagonal passage 48 which extends beyond the passage 40 (Fig. 7) forms a niche which produces-turbulence in the gases and insures a thorough mixture of them when they are delivered to the enlarged portion 4| of the passage 40.

The body portion 20 of each of the scarfing segments is also drilled to provide a passage 53 which extends from the front edge face of the tip segment to the distributing chamber 24 for the scarfing oxygen. The upper end of this passage communicates with a threaded recess 54 (Figs. 7 and 8) which is closed by a removable plug 54 (Figs. 6 and '7). This provides means whereby the pressure of the scarfing oxygen in the distributin'g chamber of any scarfing segment may be tested for the purpose that will later appear.-

' Each scarfing section of the tip is drilled transversely to providea vertical series of cooling passage sections 55 extending through its for-' ward portion, and another vertical series of cooling passage sections '56 to the rear of the cooling passage sections 55 (Figs. 6-8). When the segments are assembled the corresponding drillings in adjacent'scarfing segments are interconnected by means of thimble couplings 51, one of which is shown by itself in Fig. 10." They are preferably made of relatively soft metal such as copper and have tapered ends to permit them to be'forced into the drillings 55 and 56 when the scarfing segments are forced together. The ends of drillings 55 and 56 are preferably countersunk so that the edge of the openings at the ends of the drillings is bevelled as shown at v58 in Fig. 8. These bevels provide a slight clearancebetween adjoining segment faces to receive any burrs that may be formed on the thimble couplings when they are forced into place so that theburrs will not interfere with the close positioning of the tip segments. Each thimble coupling fits tightly in the two drillings in which it is inserted andcon nects them in a watertight manner when the tip segments are forced together. The cooling passage sections 55 are thus connected to form continuous coolingpassages which extend throughout the combined width of=al1 or the scarfing se ments-ofthe tip close to thefront wallotthe tip, and the coolin'gspassage' sections-56 are similai'ly connectedzto form continuous coolingpassages which extend throughout the combined width of all of .theiscarfing-lsegments of vthe tip an'dwhichilie ,to the. rear'rof the first-mentioned ones.

.YIhe manifold block 13 has a vertically disposed distributing chamber; 5% (Fig. i 4) :towh-ich a-cooling .medium' such as water is admitted through anzrinletplipe 60-. Eachof .the forward cooling passages55 inthe group of --scarfingsegments.

communicates with the distributing chamberififl in.,the.manifo1d block by .meansof a. transverse drilling 55' (Fig. l) in the manifold block one .ofthe thimblecouplingsi'i previously described ,(Fig '1). iIherefore, cooling water .su'ppliedflby the pipetfi "fiows'i'n parallel pathsby means of the coupled drillings 55 and 55"through all ofthe scarfi'ng sections of the tip from left to right as the tip is viewed in'Fig. 1. 'Thecoupleidd-rillings 56 in the scar'fing segments constitute return passages for the cooling water. There-may be a return "passage 'for each of the forward passages, but preferably thereis only oneo'f'such return passages for each twoof' the forward passages. The end -scarfing section 3 l2 hasa series of recesses til '(Fig. 5) closed =at the a outer face of this segment by means of plates "62. Each of theserecesses places twoof the forward cooling passages in co'mmunicationwith one of the return passages as shown in Fig.5. The drilli'ngstit are therefore-made larger in diameter than the drillings'55 so'that they canreturnthe total "amount of cooling water delivered to the right end of "the tip by the'fo-rward cooling passages.

Referrin'g again to Fig.4 it will be seen that themani-fold block l3"has=-a vertically disposed collection chamber 63 for "the cooling water. Each of the return cooling passages Min-the group of scarfing "segments communicates with the-collection chamber 63 in 'the'manif'old block by-mea'ns of -a' transverse drilling 56' '(Fi'g.4) in themanifold block'and one of the thimble couplingstllF-ig. 1). The'cooling water-returned by-airof the-return passages therefore flows into the collection chamber 63 and is discharged therefrom to "an outlet pipefM-through a connecting passage-65 in' the manifold block. The drillings 55 are-placed near the'forward 'face of eachscarfihg section ofthe tip so that the continuous cooling passages formed by them will adequately cool this portion of the tip in which the. heat concentration is the greatest. .Anysuitable number of passages may be-provided as long as i'the-capacity of the cooling systemis great enough to circulate a sulficient quantity of cooling water .through the tipto' maintain a safe temperature.

An independent cooling systemis provided for thessupport 15. As shown in Fig. 5, cooling passagestfi and B! extendthrough the support from one end of. the. group of scarfing segments'to the other. (At 'one end of'thexsupportthese passagesyare connected by a recessfiB closed 'at its outer. side by a: cover plate 69. 'Atthe other end of:thesupportscooling water is d'eliveredtb one of'zthe passages-by a tube in and is discharged frorn the other-passage by a second tube '1! (Fig l).

:The side of the shoe portionll-ofthe'support adjacent t he work surface is 'provided with "a number 1 of work enga'ging :shoes 'H (Figsaihst aind.

7); The shoes are'o'f the-same.widthastthe sc'arfing segments of thextipa-and .are'easily removablelto permit their replacement '-when..they:;become worn. This is preferably accomplished-shy. shaping theshoes as-best shown .inFigiliiso'. that. each of them-has a pai-r ofipr'ojectio'ns' Iii-which are received by complementary shaped recesses linth'e sup-port when v.the'sh'oe is slid rearwardlyinto position under the shoerportion H of the-sup port. Whenthe; shoes are in thispositioma-re ces's T5: in each shoe registers with aicomplemena tary recess 'l-fi in. the portion I! iofl the supportto' form: a heywaywhich. receives a key '11. ltisiob vious that when the key is in'positionithexshoes ar'ellocked to the shoe portion I! of .thesupport since they 'can'notcmove' forwardly, "andgso long as they cannot do so the projections? 13 on the shoesengaging in. the recesses". .onthesupport hold-the shoes 'in: position. if/h'enanysshoe-v becomes worn-it carrhe readily removed: and' re placed bywithdrawing thekeyi 71.

The-shoes 12 and the support [5 :transmit shocks directly'to that part of the scarfingiima chi-newto which the support is attached without harmiul cheats on the scarfing segments. .?This would not be true if the scarfing segments were sandwiched between theosh'oes andsuch 'partooif the scar-fing machine in'such1a:way that';they had to transmit the shocks.

It will-now be seen thatr'eachscarfingjsegment is 'a complete-scarfing;ti-p.in itself except; for the cooling system, having its ownapreheat passages and mixer for the. preheating gases and its :own scarfing oxygen distributing. chamber, and .sca'it ing oxygen jet passages. Each scarfing ;.segment also has its'own supply of scarfingcoxygen and its own supply of preheating gases. :These are controlled .separately for' eachas'carfing segment by suitable valves whichxare .notdshow'n.

The complete tip may. comprise. .any'number oi scarfing segments and...can:1be of :any desired width. Ordinarily, enough scarfingsegments'wi-ll be used in'making upthe tiptogivethe'complew tip a total width that willimake itscapablei-of scarring the widest work-:piece :that is :,:likely to require scarfing in theiparticular.installationin which the scarfing tip. is employed. :For narrower work-pieces ithe efiective uwidth .of r the tip :canbe reduced. accordingly: by shnttingaofrthe supply of gases to the scarfing segments :that are not-required. 'It is therefore. advantageous that the scarfing segments beiquite narrow 1 5011311317 the effective -width of the :complete .ftipscan :be reduced in small increments. In the-tipqillustrated they are only one inch-wide, although of course they may be wider-than that if desired. The jet. passages 33- for 'the scarfing 'oxygen rare drilled in each scarfing segment as. close.:tog'ether as practicable. For instance, as-shown in Fig. :9, a scarfing segmenthne: inch in zwisdtht*may.'ha ve seven= scarfingv oxygen jet passages-madezwithca one eighth' inch. drill so that the centers-oi :the passages are spacedt ei" apart. 'Because of: the close spacing 0f the soarfing oxygenzgi'et passages (whichwoul'd not be possible ifsth'e'scarfing jets issued through'separate nozzles secured'to *aftor'ch head) 1 and because of the kind of cooling :system employed (which eliminates thenecessity of 'ha'ving a "cooling *chamber in each scariing segment with side walls in which a scarfing 'oxygenj'et passage-can not be located) the scarfing oxygen issues-"in jets that are so closely spaced --acr0ss the entire width of the complete' tip thatthe scar fing -oxygen is substantially the I form of acontinuous sheet. The front edges of the dovetail recess 3|, the bottom wall of which serves as a discharge face for the scarfing oxygen jets, constitute .bafiles which act on the scarfing oxygen jets after they have expanded substantially to atmospheric pressure to convert them into a still more sheet-like form. Each recess 3! in one scarfing segment aligns with and forms a continuation of the recess inian adjacent scarfing segment to form in effect a single recess which extends continuously throughout the combined width of all of the scarfing segments. A scarfing method in which a row of individual scarfing oxygen jets are bafiied by the edges of a recess through the bottom 'wall of which the scarfing jets are discharged is claimed in the copending application of Joseph F. Kiernan, Serial No. 742,011; filed April 17, 1947, now Patent No. 2,532,103, assigned to the same assignee as the present application, and that application covers more broadly than the present one a scarfing tip having a recess similar in general to that above described, and the edges of which have a baffling action on the scarfing oxygen jets.

By removing the plugs 54' the pressure of the scarfing oxygen in the distributing chambers of all of the scarfing segments may be tested, and the valves which control the supply of scarfing oxygen to the scarfing segments can then be adjusted to make the pressure of the scarfing oxygen in all of the distributing chambers uniform. Or, if it is desired to have the scarfing oxygen jets issue in a non-uniform pattern so that by so doing the scarfed surface on the work-piece will then be substantially smooth or given some special shape such as concave or convex, the valves that control the supply of scarfing oxygen are adjusted accordingly. The plugs 54 are then repositioned and the tip will then be permanently'calibrated until replacement of some worn or damaged scarfing segment necessitates recalibration, or until some different pattern of oxygen flow is desired.

, The special construction of the block type scarfing segments makes them easy to manufacture and also makes it possible to position the jet passages for the scarfing oxygen close enough together to provide a substantially continuous sheet-like stream of scarfing oxygen across any desired active width of the complete tip.

I claim:

1. Asegmental scarfing tip comprising a block made up of a plurality of individual smaller blocks positioned side by side and each of which has a recess extending across the width of one of its faces the bottom wall of which constitutes a discharge face, the outer edges of the recess being spaced apart a distance equal to less than the transverse dimension of the bottom wall thereof, each individual block also having wholly within itself a row of jet passages extending to said recess and terminating in a row of discharge orifices formed in the bottom wall of the recess, means for distributing scarfing oxygen to all of the jet passages in said row, and means for holding the individual blocks together with their recesses in alignment to form a continuous recess throughout the combined width of all of the blocks, the edges of the recess having a bafiiing action on the scarfing oxygen jets to convert them into a more sheet-like form.-

2. In a gas torch, a segmental torch tip comprising a plurality of individual segments positioned side by side and each of which has a discharge face, eachindividual segment also havholding the individual segments together and afiixed to said common support, said support having a shoe-supporting portion common to all'of said segments and provided with shoe means.

adapted to engage the work and keep the individual segments out of contact with' the work, said support further having another portion rigid with the shoe-supporting portion adapted to be secured to a supporting structure whereby the shock received by the shoe means is transmitted through the portions of said support to the sup porting structure independently of said individual segments.

3. A gas torch in accordance with claim 2 in which the shoe means comprises a series of individual shoes, and means for securing all of the shoes to the work-side of the shoe-supporting portion of the support.

4. In a segmental torch tip comprising a plurality of individual blocks positioned side by side and held together in that relation,.the improvement which comprises a cooling system forthe torch tip including a plurality of pairs of cooling passage sections extending transversely through each of said blocks from one of its side faces to the other so that each cooling passage section in each block is in alignment with the corresponding cooling passage section in an adjacent block, means connecting each cooling passage section in each block in a liquid-tight manner with the corresponding cooling passage section in the adjacent block to produce a plurality of pairs of continuous cooling passages which are common to all of said blocks, means at one end of the torch tip for placing the two continuous cooling passages of each pair in communication,

I and a manifold block at the other end of the torch tip having a distributing chamber communicating with one continuous cooling passage of each pair and a collection chamber communie eating with the other continuous cooling passage of each pair, means for delivering cooling liquid to said distributing chamber, and means for discharging the cooling liquid; from said collection. chamber.

5. In a segmental torch tip comprising a plurality of individual blocks positioned side by side and held together in that relation, the improvement which comprises a cooling system for the torch tip including a plurality of pairs of cooling passage sections extending transversely through each of said blocks from one of its side faces to the other so that each cooling passage section in each block is in alignment with the corresponding cooling passage section in an ad jacent block, means connecting each cooling passage section in each block in a liquid-tight man-: nor with the corresponding cooling passage section in the adjacent block to produce a plurality of pairs of continuous cooling passages which are common to all of said blocks, one of the end blocks having a plurality of recesses each of which places the two continuous cooling passages of each pair in communication at that end of the torch tip, a manifold block at the other end of the torch tip having a distributing chamber communicating with one continuous cooling passage of each pair and having a collection chamber communicating with the other continuous cooling passage of each pairgmeans for delivering cooling liquid to said-distributing chamber;

and means for..discharging thecooling liquid'fmm said collectionlchamber.

6; Aisegmental .scarfing;;tip;,;comprising1a plu- 'rality'- of. segments positioned side by; side: and

eachof which hasa discharge-face, meansifor holdingthe. segments together; in that relation, each segment having an independent distributchamber for scarfing oxygen, means :forr'delivering scarfing, oxygen. to..said chamber, valve means for controlling the "supply of scarflng oxygen to the distributing chamber of each segment independently of the distributing chambers of the other segments, each segment also having a row of jet passages extending from its distributing chamber to its discharge face, a conduit peratively associated with each segment leading from its distributing chamber to an external wall of the segment, and a removable member at said external wall normally closing the end of said conduit whereby upon removal of any such member the pressure of the scarfing oxygen in the distributing chamber of the corresponding segment can be tested.

7. A segmental scarfing tip comprising a plurality of metal blocks positioned side by side and each of which has a discharge face, means for holding the blocks together in that relation, each block having an independent distributing chamber therein for scarfing oxygen, means for delivering scarfing oxygen to said distributing chamber, valve means for controlling the supply of scarfing oxygen to the distributing chamber of each block independently of the distributing chambers of the other blocks, each block also being provided with a row of jet passages extending from its distributing chamber to its discharge face, a passage formed in the metal of each block extending from the distributing chamber in the block to an external wall of the block, and a removable plug at said external wall of each block normally closing the end of said passage whereby upon removal of any plug the pressure of the scarfing oxygen in the distributing chamber of the corresponding block can be tested.

8. In a gas torch, a support having a shoesupporting portion provided at one side with shoe means adapted to engage the work and adapted to support at its opposite side a tip block made up of two complementary parts, one of said parts being a main body portion and the other part being a member held between a face of the body portion and said opposite side of the shoe portion of the support, said face of the body portion being provided with a recess, the adjacent face of said member being provided with a complementing recess forming with the recess in the main body portion an enclosed gas distributing chamber, said member also having a plurality of jet passages leading from its recess to one of its edges, and means for delivering gas to said distributing chamber.

9. A composite scarfing torch tip block having two separat complementary parts, one of said parts having a recess in one face, the second part of the tip block having a complementing recess adapted to form with the recess in the first part an enclosed distributing chamber for scarfing oxygen, the second part of the tip block also having a plurality of bores wholly within it forming jet passages leading from its recess to one face of the composite block, means for holding the two complementary parts of the block in assembled relation, and means for delivering scarfing oxygen to the distributing chamber, the composite bloclc mavingwin:thatrfaceltozwhich 'saictjetmas.- sageszlead a dischargerecess:.oneside of, Whichis formed'iinzsaidione part of'athe composite :block and theother-side:of.=whichisz'formed in the-said other'part'oflthevcomposite block, said jet passages terminating in a row of discharge orifices 111313118 ibottom wall iofazsaid'.dischargerecess;

10. A compositev scarfingtorchutip block having two separate complementary parts, one of said partsbeing a main body portion havingarecess inione face and the second part being a plate having acomplementa-ry' recess adapted to form with tl'ierecessin the-main body portion anenclosed distributing chamber for scarfing oxygen, the plate having a plurality of bores wholly Within it forming jet passages wholly therein leading from its recess to one face of the composite block, means for holding the main body portion and the plate in assembled relation, and means for delivering scarfing oxygen to the distributing chamber, the composite block having in that face to which said jet passages lead a discharge recess one side of which is formed in said main body portion and the other side of which is formed in the plate, said jet passages terminating in a row of discharge orifices in the bottom wall of said discharge recess.

11. A segmental scarfing tip comprising a plurality of individual blocks positioned side by side and each of which has a discharge face and substantially flat side walls, each of said individual blocks being provided with a row of jet passages leading to the discharge face of the block, means for distributing scarfing oxygen to all of the jet passages in such row, each of said individual blocks having a cooling passage section extending transversely through it from one of it side Walls to the other, clamping means clamping all of said individual blocks together, and sealing means connecting each cooling passage section in each of said blocks in a liquid-tight manner with the corresponding cooling passage section in the adjacent block when the blocks are clamped together by said clamping means to form a continuous liquid-tight cooling passage which is common to all of said individual blocks, and means for circulating a cooling liquid through said cooling passage.

12. A segmental scarfing tip comprising a plurality of individual blocks positioned side by side and each of which has a discharge face and substantially flat side walls, each of said individual blocks being provided with a row of jet passages leading to the discharge face of the block, means for distributing scarfing oxygen to all of the jet passages in such a row, each of said individual blocks having a pair of cooling passage sections extending transversely through it from one of its side walls to the other, clamping means clamping all of said individual blocks together, sealing means connecting each cooling passage section in each of said blocks in a liquid-tight manner with the correspondng cooling passage section in the adjacent block when said blocks are clamped together by said clamping means to thereby form a pair of continuous liquid-tight cooling passages which are common to all of said blocks, means at one end of the torch tip for placing the two continuous cooling passages in communication, and means at the other end of the torch tip for introducing cooling liquid to one of the continuous cooling passages and for discharging it from the other passage.

13. A segmental torch tip in accordance with claim 12 in which said means at one end of the 11 12 torch tip for placing th two continuous cooling Number .1 Name xDate passages in communication comprises an end 2,220,245 Jones et a1. Nov. 5, 1940 block having'a recess that communicates with 2,288,898 French July 7, 1942 both of said continuous cooling passages. 2,362,536 Bucknam Nov. 14, 1944 HOWARD G. HUGHEY. 5 2,398,884 Crowe Apr. 23, 1946 2,417,670 Anthes Mar. 18,1947 References Cited in the file of this patent 2,418,208 Walker Apr. 1, 1947 TENT 2,435,638 Shorter Feb. 10, 1948 UNITED STATES PA S 2,484,123 Scherl Oct. 11, 1949 Number Name Date 10 557,506 Nyberg et al. Mar. 31, 1896 FOREIGN PATENTS 1,371,481 Hartfield Mar. 15, 1921 Number Country t 2,058,388 Rendleman Oct. 20, 1936 703 339 Germany Ma 6, 1941 

